Created attachment 9850 the whisker menu, with its title is shown If the title of Whisker Menu is edited, it renames itself to "Applications Menu" after a reboot, or logout/login. I am using Xubuntu 20.04 with `xfce4-whiskermenu-plugin` version 2.4.3-1 I have attached a screenshot.
Already fixed in commit 86b6bff627e2e9ddcb2ebc3998d5771a5d583ef6
Once the new version is released, could you mark it something like an important or security update? Otherwise Debian and LTS version of Ubuntu probably would not update to that version.